The short answer
A torn ACL (vets say CCL) is the most common reason a dog suddenly limps on a back leg. Small dogs sometimes heal with rest and rehab. Larger dogs usually need surgery.
Signs to look for
- Sudden limping on a back leg
- Sitting with one back leg stuck out to the side
- Swelling on the inside of the knee
- Trouble getting up or jumping
Treatment options and costs
Costs from Dogster and Lemonade, 2026. Your vet's price may differ.
Recovery, week by week
- Weeks 1 to 2Crate rest, short leash walks
- Weeks 3 to 8Longer walks, rehab exercises
- Weeks 8 to 12X-ray check, more activity
- After week 12Back to normal, slowly
Gear that helps at home
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BPC-157 and TB-500 for torn ACL (CCL): what is known
Some owners read about peptides for ligament injuries. Here is what is actually known. Neither is FDA-approved for animals.
Should you give your dog peptides after TPLO surgery? Or see BPC-157 vs TB-500 for dogs: which is better?.
Does BPC-157 help a dog's torn ACL?
Nobody knows, because BPC-157 has never been officially tested in dogs with a torn ACL. No clinical trial exists, and it is not FDA-approved for animals. A torn ACL leaves the knee unstable, so surgery is usually advised for medium and large dogs. Have a vet examine the knee first.
What a torn ACL does to a dog's knee
Vets call it the cranial cruciate ligament, or CCL. It is the dog version of the human ACL and one of the main things keeping the knee stable. The American College of Veterinary Surgeons (ACVS) says a rupture is one of the most common reasons for back-leg lameness.
A dog's tear usually differs from an athlete's injury. ACVS says rupture usually comes from gradual wear of the ligament, even when the limp appears suddenly. Partial tears are common and almost always go on to become full tears. Age, obesity, poor fitness, genetics and body shape all raise the risk, and Rottweilers and Labrador Retrievers are among the breeds affected more often.
Our torn ACL page covers the signs, each surgery, 2026 US costs and a week-by-week recovery timeline.
When to see your vet
If your dog suddenly can't use a leg, call your vet today. Sudden severe limping, a limp lasting more than a day or a swollen knee all need an exam. Sitting with one back leg stuck out to the side is another common sign. A vet video call can help you judge urgency, but your own vet will need to feel the knee.
Until then, keep your dog quiet and on a leash, and don't give human pain relievers. FDA warns they can cause serious harm in dogs.
Why surgery is usually advised for larger dogs
The problem is mechanical. With the ligament gone, the knee is unstable each time your dog puts weight on it. ACVS says surgery is typically the best treatment because it is the only way to permanently control that instability. Pain medicine can make a dog more comfortable, but knee pain persists because the instability continues.
That is why any product judged only on comfort misses the point. Even if a dog seemed brighter, the loose knee would still be there.
The usual operations are TPLO and TTA for medium and large dogs, and a lateral suture for many small dogs. ACVS reports significant improvement in 85 to 90 percent of surgical cases. Arthritis can progress with any treatment, but it is expected to progress more slowly after surgery than with medical care alone. The other knee matters too: ACVS says up to half of dogs develop the same problem on the other side.
Can a dog with a torn ACL avoid surgery?
Sometimes, mostly small dogs. Non-surgical care combines pain medicine, activity limits, rehab and sometimes a brace, over weeks. Weight loss is a big part of it. Arthritis usually follows.
If money or your dog's age or health makes surgery hard, say so plainly. Your vet can walk you through the lower-cost surgery options and a non-surgical plan with real evidence behind it. That conversation will help your dog more than any product. Ask about the arthritis care your dog will need either way.
What is known about BPC-157 for a torn ACL in dogs
Seller pages and dog blogs often list CCL tears as a use for BPC-157. The evidence in dogs is very thin. No clinical trial appears in PubMed (checked 6 Nov 2026), and we found no published study of BPC-157 in a dog with any knee or ligament injury.
Two lab papers include dogs. Xu 2020 reported that healthy research beagles tolerated repeated doses in a toxicity study. He 2022 measured how quickly beagles clear it, and found it is gone from the blood fast. Neither tested sick pets, long-term use or products owners can buy.
| Question | What the evidence says |
|---|---|
| Does it repair a dog's torn ligament? | Unknown. Not studied in dogs. |
| Can it stabilize the knee? | Unknown. Not studied in dogs. |
| Is it safe in a pet with a torn ACL? | Unknown. Only healthy research beagles were studied. |
| What amount would be right? | Unknown. No one has worked this out for pet dogs. |
| Is it safe alongside NSAIDs or anesthesia? | Unknown. Not studied. |
| Is the vial what it says it is? | Unknown. Products aren't checked by FDA, so the label may not match what's inside. |
Could BPC-157 replace or delay surgery?
Nothing supports that. Waiting has a cost, because a dog keeps using an unstable knee while you wait. ACVS lists meniscal tears, muscle loss and progressing arthritis among the problems linked to this disease. A few weeks spent on a trial product can mean a weaker leg going into surgery, or a choice made later with fewer options.
Blends of BPC-157 and TB-500 are sold for the same purpose. They add a second untested ingredient, and TB-500 has no published safety study in dogs that we could find. The comparison guide sets the two side by side. For the wider risks, see are peptides safe for dogs?
What to ask your vet or surgeon
If you are thinking about BPC-157, tell your vet. Nobody can advise you well without the full picture.
- Is this a full or partial tear, and how unstable is the knee?
- Which surgery fits my dog's size, age and activity, and which would you skip?
- What happens if we wait, and how long is too long?
- If surgery isn't possible, what is the best plan without it?
- What is my dog's risk for the other knee, and how do we lower it?
- Is there any reason not to use a product like this before or after surgery?
Questions dog owners ask
Can a dog's torn ACL heal without surgery?
Sometimes, mostly in small dogs: weeks of strict rest, weight loss and rehab let scar tissue steady the knee. Arthritis usually follows. For medium and large dogs most vets advise surgery.
How much does TPLO surgery cost?
$2,000 to $6,000 per knee at most US clinics in 2026, and up to $10,000 at specialty hospitals. X-rays, medicine and rehab come on top.
Does pet insurance cover ACL surgery?
Yes, if the policy started before the injury and the waiting period has passed. Many insurers wait six months for knee ligaments, and some exclude the second knee if the first tore before you signed up.
Will the other knee tear too?
Often. Studies put it at roughly 40 to 60 percent within a few years, which is one reason weight control matters so much afterwards.
Does BPC-157 heal a torn ACL in dogs?
Nobody knows. No clinical trial in dogs exists, and we found no study of BPC-157 in a dog with a knee or ligament injury. It has not been officially tested in dogs and is not FDA-approved for animals. A vet exam comes first.
Can BPC-157 help my dog avoid TPLO surgery?
Nothing shows that it can. ACVS says surgery is the only way to permanently control the instability from a torn ligament. Some small dogs manage without surgery using rest, weight loss and rehab. Ask your vet whether that fits your dog.
What did the beagle studies on BPC-157 find?
A 2020 toxicity study reported that healthy research beagles tolerated repeated doses. A 2022 paper measured how fast beagles clear it. Neither looked at injured dogs, knees, long-term use or products owners can buy, so they say nothing about whether it helps an ACL tear.
Is a partial ACL tear in a dog worth treating without surgery?
Ask your vet, and don't assume it will stay partial. ACVS says partial tears almost always progress to full tears. Your vet can tell you how unstable the knee is and what the options are for your dog's size and age.
Can I give BPC-157 while I save up for surgery?
Talk to your vet first. There is no evidence it protects the knee, and the product itself is unchecked. Ask your vet instead for a holding plan: strict activity limits, safe pain relief, weight control and an honest view of how long you can wait.
Sources
- Cornell University College of Veterinary Medicine, TPLO recovery in a retriever, 2018. Open
- American College of Veterinary Surgeons, Cranial Cruciate Ligament Disease. Open
- PubMed, BPC-157 in dogs, clinical trials only: no results, checked 6 Nov 2026. Open
- Xu C et al. Preclinical safety evaluation of body protective compound-157. Regul Toxicol Pharmacol, 2020. Open
- He L et al. Pharmacokinetics, distribution, metabolism and excretion of BPC157, including in beagle dogs. Front Pharmacol, 2022. Open
- Merck Veterinary Manual, When to See a Veterinarian. Open
- FDA, Get the Facts about Pain Relievers for Pets. Open
- FDA, Approved Animal Drug Products (Green Book): BPC-157 not listed. Open